A 12 fluid ounce can of diet soda contains approximately 12 mg of sodium.What is the molarity of sodium in the can if it is assumed that the only solvent is water?
A)0.0000435 M
B)0.0015 M
C)651.34 M
D)22988.5 M

Question

Quizplus · Accepted Answer

To determine the molarity of sodium in the can, we need to calculate the number of moles of sodium present in one can of soda.
Given, the can contains 12 mg of sodium. To convert mg to g, we divide it by 1000:
12 mg = 0.012 g
From the periodic table, the atomic weight of sodium is 22.99 g/mol.
To find the number of moles, we divide the mass by the molar mass:
Number of moles = 0.012 g / 22.99 g/mol = 0.000522 mol
The volume of the can is given as 12 fluid ounces or approximately 355 mL. As we are assuming that the only solvent is water, we can consider the volume to be 355 mL or 0.355 L.
Now, we can calculate the molarity using the formula:
Molarity (M) = Number of moles / Volume of solution (in liters)
Molarity = 0.000522 mol / 0.355 L = 0.00147 M
Rounding off the answer to two decimal places, we get 0.0015 M. Therefore, the best choice is B which is (0.0015 M).

A 12 Fluid Ounce Can of Diet Soda Contains Approximately